;Habitat;Depth;"Ro width";"Shape of eye-stalk";"Distal sp of an1 a4";"Proximalrow of an2 a3";"Lateral row of an2 a3";"Distal row of an2 a3";"Ts of mp2 a2";"Sp on pp1 exp";"Uropod length";"Shape of pn6–7 denticles";"Presence of ‘shoulder’ on anal–plates";Reference "N. tagiri sp. nov.";"Hydrothermal vent chimney";"200 m";"2.4 times";Oval;"4 sp";"8 sp";"2 ts";"6 sp";"2 ts";"21–24 sp";"> Pn7+t";Round;"No distinct";"This paper" "9 sls";"6 sls";"4 se" "N. abyssicola";Mud;"680–820 m";–;Oval;"1 sp";"8 sp";"2 ts";"5 sp";"2 ts";"25–30 sp";"> Pn7+t";Round;None;"Ledoyer (1997)" "6 se";"6 sp";"6 se" "3 sls" "N. bipes";"Clay and stones";"5–13 m";"2 times";Oval;"3 sp";–;–;–;"1 ts";"30 sp";"= Pn7+t";Round;Distinct;"Dahl (1985)" "N. borealis";Sand;"240 m";"2.1 times";Oval;"2 sp";–;–;–;"1 ts";"24 sp";"≥ Pn7+t";"Round to acute";Distinct;"Dahl (1985)" "N. koreana";"Algal mat";"6 m";"2.4 times";Oval;"5 sp";"10 sp";"2 ts";"5 sp";"2 ts";"30–38 sp";"< Pn7+t";Round;"No distinct";"Song et al. (2012)" "6 sls";"6 sls";"4 se" "N. mortoni";–;"17 m";"2.4 times";Oval;"4 sp";"7 sp";"2 ts";"6 sp";"2 ts";"25 sp";"= Pn7+t";Square;"No distinct";"Lee and Bamber (2011)" "4 sls" "N. schizophthalma";–;"2886 m";"2.6 times";Bilobed;"5 ts";"10 sls";"10 se";"6 sp";"2 ts";"15 sp";"< Pn7+t";Acute;None;"Haney et al. (2001)" "8 se"